Relating to the possession of firearms in certain public areas.

Authorizes governing bodies of certain public entities that own or control public building to adopt policy, ordinance or regulation or precluding affirmative defense for possession of firearms in public building and adjacent grounds by concealed handgun licensees. Provides that in prosecution for possession of firearm in building or on grounds subject to such policy, ordinance or regulation, concealed handgun licensee affirmative defense is not complete defense, but results in Class A misdemeanor conviction punishable by 364 days' imprisonment, $6,250 fine, or both.